"We need to make sure we communicate better as a team. In my opinion we were also a bit too hurried in possession," Sommer told UEFA's website (www.uefa.com).
"We were playing against 10 men for the majority of the game and didn't always make the most of our numerical advantage. We gave the ball away sloppily at times."
Sommer predicted Romania would change their tactics following Friday's 2-1 defeat by France but urged his side to stay calm in the face of uncertainty.
"We have the wind in our sails and the only thing that counts is the result... They are a team that prefer to sit back, so I'm interested to see how they will approach Wednesday. Whatever they do, we must keep our cool," the 27-year-old said.
(Reporting by Shravanth Vijayakumar in Bengaluru, editing by Pritha Sarkar)
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